Yalan Gur was a member of the Green Lantern Corps and noted as one of the greatest of the servants of the Guardians of the Universe around two thousand years ago. At the time, he was stationed at his home space of Space Sector 2814 where at one point he came under attack from a yellow beast that nearly killed him due to his Green Lantern Power Ring's flaw. This led to the Oans questioning if they should risk their greatest Green Lantern on such an arbitrary weakness. Ultimately, they decided to remove the Yellow Impurity from Yalan Gur's Power Ring alone in the belief that he would remain their faithful servant.